I believe the X an Y were 10mm on the ballscrew size and I want to say 3/8" or 1/2" on the motors.... Ill have to check when I get home.
I need to make a drawbar for the mill. Does anyone see any issues with using a length of B7 7/16x20" rod (7/16"-20 x 3' Plain Finish B7 Continuous Threaded Rod | Fastenal) and a 7/16" x 20 coupling nut (7/16-20 ROD COUPLING NUT, 18-8 STAINLESS STEEL | Fastenal) pinned to the top? Does it need to be any more complicated than that?